Refactor integration test

[mwojtyczka]

Changes

Linked issues

Resolves #..

Tests

• manually tested
• added unit tests
• added integration tests
• verified on staging environment (screenshot attached)

[github-actions]

✅ 41/41 passed, 5 skipped, 7m28s total

_{Running from acceptance #179}

[JCZuurmond]

set_shared_cluster is only used by test_databricks_connect, it does not have a teardown and it is just one line, so maybe you can move it into the test. Approving so you can move forward

[mwojtyczka]

set_shared_cluster

Thank you!
We need to set the cluster before the ws fixture is created. Therefore a fixture is required here.
I added missing teardown.